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Re: Semithin 754/756/758 [message #15976 is a reply to message #15579] Sun, 02 January 2022 19:10 Go to previous messageGo to previous message
Jenneke is currently offline  Jenneke
Messages: 2053
Registered: May 2013
Location: Netherlands
Gruen Authority
Something fishy is going on.

Caliber 758 exists with 15 and 16 jewels.

In the 1939 material catalogue the 754, 756 and 758 have the same setting mechanism:
/vgforum/index.php?t=getfile&id=8887&private=0

The spare 754 movement I bought for my 756 turns out to have a different setting mechanism.
In fact, that looks the same as the caliber 740 in the 1926 parts catalogue. Almost as if the 740 is the 17 jewel and the 754 the 15 jewel version.

Somewhere over the years the 754 setting bits where changed. From a two part stem to a single, from two sides setting bits to one side with different shapes.

/vgforum/index.php?t=getfile&id=8889&private=0
/vgforum/index.php?t=getfile&id=8888&private=0
/vgforum/index.php?t=getfile&id=8890&private=0

You can only waste time if you forget to enjoy it - Loesje

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