Sutnan Capacitor Information

I got an email that asked what is the meaning of the first two code of a polyester (mlyar) capacitor. Here is the question:

“Hi Jestine! Hope your doing fine. I just want to ask these question.
Some polyester film mylar capacitor have code markings like these: 2A102K
No doubt that this has a value of  .001uF with a tolerance of +10%. What I need to know
is what does 2A stands for? Is it voltage rating? Others begin with 1H, 2B, 2D,
2E, 2F, 2G, 3A, 3C, etc. Please provide me some data regarding these. Thanks.”

I used to ignore the first two codes as normally it would be in the 50 volts rating and i only calculate the capacitance and the tolerance. Since there are so many different number in the first two numbers, i guess it could be some meaning behind it. From search engine i could not  locate any data about it. If you know what the first two numbers stand for please give a comment- thanks in advance!

I'm selling my JL Audio VR 650 CSi components. They are 6.5" - the woofers are in perfect condition, the crossovers have some glue on them from the tape that was used on them to mount inside the doors (has no affect on crossover performance). One of the tweeters needs to be replaced (distorts at high volumes). I ran these in 4ohm stereo (85w each) on my Directed Class D 5 channel amp. I'm also including 6.5" speaker adapters for easy mounting.

Asking $75 shipped for everything.

VR650-CSi Component Systems Specifications:
VR650-CSi Component Systems
Description: Evolution™ VR 6.50 in. / 165 mm Component Systems:
6.50 in. / 165 mm Woofer; 0.75 in. 19 mm Silk Dome Tweeter, Grilles Included
This component system is a direct-fit into most newer GM vehicles and a large number of European cars. Exceptional midbass output and super-smooth midrange and high-frequency response make this an exceptional value for the quality conscious car audiophile.

Woofers: Injection-molded, mica-filled, polypropylene cone body, 1.0 in. / 25 mm voice coil, flat-profile/ symmetrical-roll spider, butyl rubber surround.
Tweeters: 0.75 in. / 19 mm silk soft dome tweeter, neodymium magnet, ferrofluid cooled and damped. Variable mounting system with swivel/rotation capability.
Crossover Networks: 2-way network with 1st order low-pass circuit and 3rd order high pass circuit. Premium Mylar Capacitor and Air-Core inductors. Adjustable tweeter output level. Polyswitch tweeter protection
Continuous Power Handling: 60 Watts
Rec. Power Range (per channel): 15 - 100 Watts
System Efficiency: 89.5 dB @ 1W/1m
System Nominal Impedance: 4 ohms
System Frequency Response: 59 Hz - 25 KHz ± 3 dB