I could not find any info on this seemingly high grade Bulova 10BNCHR movement; 10.5L, 23J, hack second, micro regulator, 5 positions adj plus temperature. Movement date shown 1962 production. I have a few 15J 10BNCH cal used in A17A and MIL-W-3818A Korean era military watches but have not seen this one before. Is this a railroad approved Bulova watch? If anybody has any info on the correct case reference will be much appreciated.

Movement scan

Trying to determine what the R is, in the 10BNCHR?
Anyone?

Thought I might make a bid on this until I watched the price sky rocket to a final price of $680.
Bulova 23J Transportation Special

10BNCH was their later military watch,I suspect a railroad version was to bring new life and markets for the movement. The 'R' must designate railroad. It may have been a special order for a wholesaler. 1960s was when wristwatches were finally RR approved. Apparently watch was not a big success because I can't recall any info in any of our Bulova material catalogs or service bulletins or factory communications.

Here's a link to the "family/generation" of that model. Bulova

"10BNCHR: details uncertain" Guess we know more than Dr Ranfft.

BTW a google search will bring up some good information. There is a good Bulova watches website for collectors.