Konica 50mm and Topcor 5cm LTM

[Miles.]

My Topcor is the non-S version.
This lens's serial number definitely starts with 13, commonly known as the 13B.
(Sharper than the Summicron Coll.)
Recently, I've seen ones starting with 15 without the S.
I would appreciate it if anyone could share information.

Yes, the Topcor (non-S) is a different lens. I have serial numbers indicating about 2,500 were made.

Presumably the serial numbers started at 13,000 based off my data.

 

[Young Shawn]

Yes, the Topcor (non-S) is a different lens. I have serial numbers indicating about 2,500 were made.

Presumably the serial numbers started at 13,000 based off my data.
View attachment 4877103

Thank you for the valuable information!
The production volume of this lens—exactly the information I was looking for!

I'll look for books by Topcon and Leotax within Japan.
I need to look for a more detailed guide.
Jewelry from the 1950s...

Thank you!