I acquired a Craigslist bike frame, Steel lugged "Flandria" bike had a rear der. but not a hanger but hooked on the axle. Does this style of frame put the bike in the 70"s or early 80's? Stripped it down as someone hand painted the frame looked very bad.

It's most likely 1970s but it could be later or earlier. You should post pictures of the frame and the components that it came with, as these will provide clues to the era.

In the 1960s and well into the 1970s, an integral derailleur tab marked a mid-to-high-end frame, whereas a separate claw hanger, such as you describe, was typical on low-end and some mid-grade frames.

Flandria, main
unfortunately, example bike doesn't show a drive-side photo
https://www.classicrendezvous.com/Ben...ia_catalog.pdf

still making bikes, not much history on their website
History

I think the question being asked may have been forged v. stamped dropouts.
Forged dropouts will generally have the RD boss forged-in and tapped and are used on higher grade frames

Bikes with stamped-from-plate dropouts will generally use separate derailleur hangars.

It is likely one of the cycles done on contract in Portugal. A real Flandria but not a Belgian one.

Actually, those particular dropouts are neither forged nor stamped, but rather investment-cast. Investment casting has a couple advantages, i.e. easier to braze and finsh, but can be limiting in the types of tubing and angles they can accept, and tend to be much harder to align than either forged or stamped dropouts, both of which are usually made from malleable, mild steel.

Forged dropouts may have variable thickness (thicker faces where the axle clamps, thinner tabs where they insert into the stays, and may have Blanchard-ground faces e.g.:



Stamped dropouts are usually quite thin throughout, lack a derailleur mounting tab, and in general cheaper-looking:

Didn't realize "named" dropouts could be stamped - although those are nicer than most stamped dropouts.