Reference 3A Grand Veena

I would like to know how to distinguish between the newest improved version and the original ones.
Do the serial numbers give a clue?

OCC internal wiring
Mechanical grounding of drivers
Soft brass screws and washers for driver
Copper shorting rings on midrange
Larger brass cones and floor pads
5 way binding posts with tellerium copper
Occ binding jumpers
Don't know what # this started at but it is very recent.
Would assume that if it has the brass screws, it has all the upgrades.

I believe the screws are brass, painted black on tweeter and mid.Super tweeter is brass, woofers aren't painted,so they appear to be reg non brass screws.Also different screw heads.
The speakers have spikes,and they are black/grey,I can't tell if they are brass, but they don't seem like cones.No floor pads.
The speakers came with Cardas solid copper jumpers,not wires.
The binding posts are 5 way, with clear plastic I can't tell what they are made of.
Maybe I should check out the internal wiring and see what is inside.
I believe the improved wiring sheath is supposed to be clear?
I seem to have 6 of one and half dozen of the other

The list was passed out by Tash at RMAF. Those are the improvements.
The older versions don't have those improvements.

An easy way to find out what screws are brass or not is to take one out and hold it to a magnet. Pure brass won't attract to the magnet because it is non-magnetic.