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The colour is another clue - old grey and new grey for example. Also older white and blue bricks will possible have a bit of fading or yellowing. Types of window and door frames vary over time too, so best bet to find out is Bricklink again.
I'm also in the process of sorting out a mix of my old sets and newer sets. Its been a tough job, mainly trying to determine new and old grey - after a while they all look the same :) My oldest sets are from the early 80s though, so not as hard as sorting through stuff from the 70s. Good luck!
I tried snapping some pictures for a name that era sort of puzzle, but my camera just can't handle the extreme close ups.
I think it would be cool if for basic bricks and some plates, 1xN or 2xN, there could be a photo reference of the underside so folks wouldn't botch recreating older sets. I could care less if some of the stuff in my collection is mish mashed, as long as the color is uniform, but for the classics from the 70s and 80s, I want to get it right.
Could this become a master thread, so that folks who have confirmed bricks from a given mold era could post pictures of the undersides of basic bricks and plates? Thanks!
According to Bricklink, all the bricks in #6392 are all standard.
Variations can include no logo, block letters underneath, bar bell logo underneath, old logo on studs, logo on studs and underneath (rare), new logo on studs, Samsontie logo stud (open O), mixed Samsonite logo (open and closed Os), non pat pend, pat pend, obscured pat pend, void, part id, pip on side, pip stud, center pip, slotted and tubeless bricks, tubeless bricks, tubes without cross supports, slit tubs, tubes with supports, Minitalia X brick, Minitalia tube bricks, no pegs, solid pegs, hollow pegs, CA bricks and ABS bricks. That nearly everything I can think of. Clearly there are a lot of combinations. Some combination would never exist.
And there is lots of overlap. Once molded, unless it is defective, it will be used. Let's 6080 for example. Sold 1984 to 1987. It would only bricks with the new (ie current) logo and would only have parts made from ABS. The mostly bricks would be void and part id, but the year it was packaged and location can influence the type that was used. Pip location was in flux, but moving to on stud.