He and his not yet identified children might form the links in some of the suggested lineage conjunctions between forefather “Mostel b’ Josef Schaffhausen mi Nürnberg” and his further known descendants.

Josef b’ Mostel is not mentioned in the Nürnberg Councilbooks. For the cause of this may be two options: (1) As he has the given name of his grandfather Josef, it might be assumed that he was the eldest son of Mostel — and must have been born between 1465 and 1472. If so: he may have left Nürnberg at young age, long before his family had to. (2) The other (less plausible) option would be that Josef was younger than his brothers (being not ‘firstnamed’ in the usual order, e.g. because their grandfather was still alive) — and may have been born not much earlier than 1490, thus as a child still too young to be mentioned in the Town books. In the current stage of genealogical research I’m following the first option.
So, presumably Josef b’ Mostel was born abt 1470 in Nürnberg and left the town around 1485, i.e. after having begun to learn the goldsmith craft from his father— [perhaps marrying young, who knows to a daughter of another goldsmith living elsewhere, who knows in or near Stuttgart — by the way: also from this town the jews were expelled; in 1498 — The yiddishe name of Stuttgart “Shtuckert” was added to the surnames of several following generations of the Goldschmidt family]
Josef obviously has been in regular contact with his family, his father and his brother Isaak — while it seems that during some periods he was staying in the region of Frankfurt.

Sustaining facts:
> 1524 [cf Ele Toldot, Frankfurt, Ug E.56.F.1, Jahr 1524 ®27] “Josef Goldschmidt (d. abt 1550) has a son who was [converted and] baptized as Christoffel Forpach, now living in Würzburg, demanding support from his father” — several conclusions from this fact might be possible: Around 1524 Josef was (temporarily?) staying in Frankfurt — and his birthyear can’t have been much later than 1495.

> ca 1537: [Quote] “…..one Jewish goldsmith, Baruch, does appear in East Franconia, who, on being received in Schwarzach in 1537, promised to live only by his craft.” — this passage is from an entry in “The Jewish Encyclopedia” ®52, refering to an article in “Monatsschrift” ®51
[NB: later I found the original text of the quoted article (Monatschrift 1880, Vol 10, october, p 463) ®51 by Heinrich Epstein, where more specifically was mentioned that Baruch’s father was already living in Schwarzach! Though it seems questionable that it was exactly in the quoted year 1537 — for that matter: from the article’s context must be concluded that this fact concerns an ordinance (likely dated even before 1537), issued by the prince-bishop Konrad II von Thüngen who was reigning East-Franconia 1519-1540]
“…..In einem Erlass vom Jahre 1537 verbietet Konrad auch das Beherbergen der Juden ‘)…… Mittlerweile werden mehrere jüd. Familien auf Lebensdauer in Schütz genommen und ihnen ein Wohnsitz angezeigt. Interessant ist die Inschutznahme eines ״Juden Baruch”. Dieser nemlich war Goldschmied von Beruf und erhielt gleich seinem Vater die Erlaubniß, in Stadtschwarzach zu wohnen. Er verspricht, nur seinem Handwerke zu leben und mit fremden Juden nicht zu verkehren. Sollte es den Bisch. gefallen, ihn aus Stadtschwarzach zu ״versetzen", so wolle er sich fügen. Ueberhaupt verspricht er unbedingten Gehorsam ‘)”.
— this said Baruch might be a son of Josef b’ Moshe Goldschmidt Nürnberg — and as well maybe the forefather of Baruch [Benedikt] b’ Jehuda-Leib Goldschmidt Kassel (d. 1642) and his offspring [cf]

> 1542 Josef is working as goldsmith in Schwarzach — “Joseph v Schwarzach” is mentioned as a brother of Isak v Aschaffenburg [cf ®26 p.443, note 61] . Together they filed a claim against the “Hanauer Untertan Philipp v Dorsfelden” [cf ®48 p.313, notes 191, 193)

[NB: — Stadtschwartzach, nowadays usually named Schwarzach-am-Main is situated 20 km east of Würzburg [cf his converted son NN], 70 km northwest of Nürnberg [cf his birthplace], 85 km south east of Aschaffenburg]

> 1550 “After the death of the goldsmith Josef his brother Isaak Moshe Aschaffenburg (Goldschmidt) is the Guardian of his children” [cf ET: Ge 1550-122] — conclusion: Josef’s younger children (not yet married in 1550) must have been born not much earlier than 1535. Thus Josef may have been married more than once and in the last years of his life he may have been living (again?) in the Frankfurt Region.

the here-above stated record of Josef b’ Mostel Goldschmidt, might hereafter be followed in a hypothetical offspring construction, tentatively linking the son(s) of Mostel Goldschmidt Schaffhausen with the later generations