Looking forward to it! Most of the dates on the known invoices are stamped on, correct?
This post has been on my mind so not wanting to distract from any of your valuable tangents but I have something I'm wondering about concerning this subject. I get it, you're shooting for later and I'm going in the other timeline direction!
Curios as to the date of these pages and the reference to 1895...
Noted John Cote states in his post the catalogue as "D. Gruen & Sons" but was curious what *your* best guess is at the date of publication. Thanks.
I too posted an ad somewhere the one with the 1895 Guarantee Certificate of 62208 and entitled "Gruen's Precision Watches".
Gruen's Precision Watches is the name of an earlier 1895 Gruen catalogue w/ sm small references mentioned you may find interesting like still in Columbus, Germany, of note an 18 size, etc.
Good work.