Crackled Glass Insulator. This is marked with a D in a diamond (dominion glass) then a dash (-42). I am from Canada. I thought I read that this may mean the year, as in 1942. Is this correct?
I have been told (?) that these are *misfired* when made. You can not feel any of the cracks on the inner, or outer surface...it is all smooth. The cracks are truly inside. Are this a misfired Insulator Glass?
Any comments/corrections about the age/maker/style/ and history and/or knowledge about crackled glass Insulators.
Thanking you in advance...