Tom Uban wrote:
That appears to be a fairly common disk pack as used
in drives such as
an DEC RK05 and similar.
It definitely isn't similar to any RK05 disk pack I ever saw.
But there are a lot of non RK05 14" disk drives.
There were a number of drive manufactures who
used that style of disk pack. The number of notches (sector markers) in
the bottom metal hub ring will give a better idea of what machine the
pack was likely used with.
The RK05 packs are available with 12 (for pdp11) and 16 (for pdp8)
sectors (13 or 17 notches).
Just my 2 cents
Gerold