Yes, HC-110 would be a fine choice. At the age the plates are at, I'd assume an EI of about 10. They might have been as fast as 25 or 50 new, but they aren't now.

If they're sort of a pale sickly green color, they are probably orthochromatic.

The conventions are for dark slides with color coding (white unexposed, black exposed), or with bumps (originally the nail heads for the handle) bumps out for unexposed, bumps in for exposed.