Thinking of selling my Canon 300 2.8 with image stabilizer

It's really heavy for me. I'm a 95 pound woman. Think the 70.200 would be a better fit, especially the newest one out. I've had it for about 18 months, bought here I think. Excellent condition, has case, lens hood, & tripod plate, also including a Canon 1X4 extender which has stayed on the lens since I've had it. Asking $4200, you pay paypal charges & shipping too which is not included in my asking price. I will upload pics later. Excellent condition, no dust, fungus, lens clear & what a lens it is but just sooo heavy for me! Price dropped to $3800. Will be putting up on Ebay also. Minor paint loss around upper rim of lens Otherwise excellent condition. Tripod plate not included with price drop!

Is there a Date Code on this lens....Thank You

Not sure where to look for it. There is a number on bottom of lens 41038, is that it? Also, the extender is a Canon not a Sigma as stated!

Date code: UW0220