Great Pics ! @
classicarman .
First of all, I think it is a great looking bike !
It is certainly an interesting find - like most Rory O'Briens.
On the seat-tube, I can see a rectangular Reynolds 531 decal/transfer. Because of the angle of the photo, it is difficult to read the transfer; in the gold area at the bottom of the transfer, if it reads :-
Manufactured by
Reynolds Tube Co. Ltd
Birmingham England
. . . . . . . then (in theory) the frame dates between 1973 & early 1977.
However, if in the gold area at the bottom of the transfer, it reads :-
Manufactured by
TI Reynolds Limited
Birmingham England
. . . . . . . then (in theory) the frame dates between mid 1977 - mid 1980s.
Reynolds added the gold box and address at the bottom in 1973. Although Reynolds were part of TI earlier than 1977 they didn’t change the contents of the gold box at bottom until 1977.
However, there would still have been a lot of old print stock knocking about, that would have gone onto later-built frames and indeed, I've seen mid-’80’s with pre-’73 decals on them. And of course, it is quite possible, that this is a frame that has been resprayed/enameled at some time.
If this has the later TI Reynolds decal (1977 - mid 80s), then I'm surprised that the frame has no brazed-on cable guides on the top tube and no braze-ons for the shifters - in my (non-expert) opinion
, the lack of these features would suggest an earlier frame. I think that you have a very attractive 1970's Rory O'Brien, though it is difficult to tell whether early or late 70s. I don't think that it is a 60s bike, or one built in the 80s.
I wonder if the Shimano Crane derailleur is original to the bike ? They were introduced in about 1975/6 which would tie in with the likely age of the bike.
Perhaps other forum members might like to offer their opinions ?