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Not sure how old it is but it won't look out of place.
Would you be treating it with proofide or something similar?
I remember buying an old Brooks, the leather was kind of similar condition to that bag and although I've treated it with loads of proofide, it lasted 2 rides before almost snapping in 2 as the leather was dry in the middle.
Of course you won't be putting as much strain but might be a strap or the or the lid that breaks.
Found a saddle bag which I think is probably aged around 1940s-1950s.
No obvious maker's marks anywhere.