Will you seperate the 37 and 38 backs? And which backs have large and small know examples? I collected them for a little while before internet 1976 - 1978 and I built a few sets.The large ones were always more difficult to come accross and 37's seemed to come up less often tha 38's. Good luck I will see if I have my old notes on backs I came across during my search.
J
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