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The Weymann Serial Number Dating Table has been recently updated with explanations of the decisions made, and can be found at:
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As mentioned above I do have a website about Weymann including Serial numbers table which has recently been updated with the reasons I have given for the decisions:...

I have a digital copy of that catalog from another source and it has a date of 1924 written on it by the original owner.

That's true, but it means the serial number is before that sale date, and more than likely not more than 12 months. It's not an exact science but each bit of information makes the dating more...

Hi Jim, Yes the first was from an instrument with a sales receipt. The other was a mandolute with a 'patent pending' label, and the patent was approved in March 1912. Production started 1910 so the...

If anyone is still interested I've managed to compile a Weymann Serial number list from the 14,000's listed below. This was compiled by 2 mandolutes coming to light, one with a purchase date and the...

This is an old blog, you still interested in the serial number date? My calculation 1909.

Hi bratsche, I know this is an old post but do you have the serial number of the mandolute in the "Attached Thumbnails" ? It looks like an early one from the decal and it maybe helpful in verifying...