I've noticed the same thing. All the rotograved examples I've seen have the same lines going horizontally across the back. They are not deep enough to grind off an old number. As well, these rotograved ones also always seem to have a half-moon, semi circle die flaw that runs around the top of the back from about 9 o'clock to 2. This isn't the same as the circular mark left by the number stamping machine on stamped badges.
They have bothered me for some time, as both of these marks only appear on this type of rotograved badge. Still not sure what to make of it, except a possible and unsupported theory is they are all from the same late run, and represent replacement badges, rotograved to order.
They have bothered me for some time, as both of these marks only appear on this type of rotograved badge. Still not sure what to make of it, except a possible and unsupported theory is they are all from the same late run, and represent replacement badges, rotograved to order.
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