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The reference is 20201.
The final 1 is a sort of sub reference, so the full reference is probably best written 20201/1 or 20201-1.
I'm not familiar with the reference but an internet search reveals it was used for the Outdoorsman.
there are many 6 digit time only references from the 40s, and while I haven't studied this issue in detail, I'm not sure they follow this pattern of -X or /X. I think they might just be 6 digit references, meaning not part of a series of 5 digit references
Thanks. I assumed that it was 5 figure reference plus a sub reference because the final digit appears to have been etched/stamped at a different time and in a different font.