Technical need a new door popper remote

I have a 1937 Chevy sedan with remote door poppers. She (Betty Boop) was built as a street rod in the late 90s. I know this because there is an "NSRA" sticker on her windshield from 1998. The remote (I have enclosed a pic) works fine but it is very shabby looking.. As you can see in the pic, the "keychain eye" has been broken off and the remote is glued to a keychain. (The writing on the remote says "Dino".) I am getting ready to sell Betty and I would just like a nice looking remote. Does anyone know how I can obtain the frequencies that are used and somehow match this to a more modern remote?

 

If you can open the remote, is there any writing or numbers on the inside?

 

Well, yes and no. I had it open when I fought bought her because the batteries died. It has 6 "watch style" batteries in it.) I did not think to look for any numbers then so I just glued it back together, like it was when I bought it. So, yes, I can probably prize it open again at the risk of breaking the outer case or cracking the outer case, or even the circuit board itself.. I'm debating on whether to risk that or not. As I said, it works fine - it's just ugly.

 

I have found a frequency detector on eBay. Hopefully I can use that to get the three frequencies from my remote and then use that info to find a new remote. Sounds like a fun endeavor at least.

 

I would not worry about a better looking remote; it is period correct for the build date.