Vintage GE Blue Dot Flash Bulbs M3B? Lot of 19

Description

Here is a lot of 19 vintage camera flash bulbs...they are marked GE and have a blue dot on top.  I believe they are M3B bulbs...but I can't be positive without more information.  The bulbs measure 1 5/8" tall and each has one bump on the top of the metal part (near the glass) which I believe guides the bulb into place on your flash unit.  Thanks for looking and be sure to view my other auctions for more vintage camera equipment!!  Happy ebaying!
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