Belly Numbers

[MMasa]

The 25 VIN is NOT factory for sure. Also, ALL cases 1924 and up are large base.
The x is still a mystery as I've never seen a belly marking letter that high.
It looks factory but your picture is a bit blurry.
I'm going to say that it's a 1920 or 21 case that had the line bore markings stamped in 1920.
Mark

[aumick10]

I agree on the VIN.
The cases have matching belly no's X0-695.
They also have casting marks of 2-18W and 2-18A.
I am sure they are factory belly numbers.
20191026_080815.jpg

[MMasa]

I agree, those are factory belly numbers. I've just never seen an X before.
Mark

[aumick10]

Thanks Mark.
Are you looking for contributions to your book?