think cyc cross a dan gurney bmx looptail and a redline together??
if you look at a dan gurney looptail there a 90% match to this frame
only 3 diff
1 seril number no a and a
2 single gusset,which is like the sq back dan gurney frame in the pic
3 the sq brake tap but also on earlier gurneys and redlines
there no other frame that closer then the gurney ,welds match,tubeing match,eben the sq brick down by the bbs is a 100% match
if you take the single gusset gurney ,then the gusset match 100% as well as the sq tap
only thing stop it from being a gurney is a number on the bb
75,76 gurney was a company and stamped aand a but it doent mean they made prottypes that were not stamped a and a and 77 is just a guess because of the bb stamped 77fo2xx