Thread: Verifying the age of a J.A. Henckles- Zwillingwerk

I first off want to apologize if this is the wrong section.
My name is Evan and I am new to the site and to the world of straight shaving and straight razors.
However I have my eye what is reported to be a J.A. Henckles- Zwillingwerk circa 1890 on ebay. I asked the owner how he knows the age and replied that he matched the blade up with a photo in a catalog. Now I have no reason not to trust him however I wanted the opinions of people who are more enlightened than I on the matter. Here are some pictures. If it is in fact legit what should my max bid be?

Greetings from Rome, Italy