Need help identifying Rollei lens hood size

[codex0]

I was recently gifted with a "box-o-cameras" that included a small Rollei hood in a leather pouch. I understand they come in a number of different sizes, and am wondering how to identify which this is.

The top says Rollei, F&H, other size has a R script, then a 1, and "Germany" under it. I imagine these may not help too much.

The inner diameter of the ring is just under 1 1/2"

 

[piu58]

I seems to be bayonet 1 for the Rolleicord.

 

[Dan Daniel]

Bay I also works on Automats (Tessar and Xenar f3.5), and many other common TLRs that take bayonets- Yashica-Mats, Minolta Autocords, etc.

 

[codex0]

I thought it might be bayonet one, but couldn't find the sizes anywhere. Thanks for your help!