What does the SZL stand for?

Initials, most likely.

If you don't believe me...
What does SZL stand for?

None of them would belong on an etching, but the artist's initials would, if he didn't want to sign his full name.

Hi, cgbighorn!

You also might want to click on the following link of this site for even more information.

https://www.askmehelpdesk.com/art/pa...ad-155531.html

Below, is a quote from what can be found via clicking on the link.

Quote:

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1. The SZ and L in the circle are the trademark of Sidney Z. Lucas,
Who owned a printshop in New York in the years 1940 to 1960. He
Produced a large number of prints after old etchings.

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Thanks!