Sorry I didn't post sooner, but I had a really busy end of week. No luck on the button which frankly amazes me. First that the manufacturer whoever it is, didn't mark their equipment and second that I cant find any reference to the button on the web. When I couldn't find any mfg info on the buttons I prepared my customer to the possibility that I might have to change buttons and plates, not much else I can do. I plan to change out all the hall buttons and save the button modules for spares in the COP.
Thanks to all for their ideas and suggestions

I had similar button try adama SM452W5 survivor series the bolt up holes match plate.Also try looking at the Innovation Prestige series both very close to what you have.

What kind of equipment is it? Who installed it?

Old Otis (60's era) basement traction with ESI controller, GAL door equipment and operator, CE digital PI's, unknown cab mfg. All newer equipment installed during mod 10 years ago +/- unknown contractor. Otis had the maintenance but I don't think they did the mod.

Unfortunately the Inovation and Adama buttons have an OD of 1.3" + and the holes in my plates are only 1.25"

Is it a serial data lift? If not just change the buttons and be done with it.