Stamped on the side of one tank.. Does this help identify it?

I am not sure but in this picture I am seeing a term "WC 1000" it might be possible that WC stands for Weight Count but I am not sure, it is better if you verify this from any other who already used this. I believe that does not give you much trouble because almost all are using the same.
In case of cost, I am searching in Google and came to know that a 20 LB tank of this gas would cost around $40.
That is all the information till now I am able to collect. If I get more information, surly I can post here

TW300 likely means Tare Weight is 300 Lbs... weight of the cylinder without propane.

Appears tank is a 120 Gal tank (usable size 100 Gals of propane. ~400 Lbs.

Cost new maybe $450-$700. Service life = 12 years befor needing to be "re-qualified." Date of Manufacture should be stamped on tank collar.

This post was edited by saltidawg on Tue, Jan 8, 13 at 9:58

ummm...those tanks belong to Suburban Propane unless you purchased them from Suburban.

They are 120's, the one you show the data stamp on was built in 1969, and is several years out of date on it's E inspection.

I would value the tanks at $150-200 each if the bottoms and all are good. 60% = roughly 72 gallons in a 120 (percentage x 1.2) and you should be able to get current market price for the gas as it does not go bad. So, if propane is $3/gallon shoot for $400-425/per tank w/gas. Again, the tanks need to be re-inspected visually by a qualified agency (propane dealer) and the bottoms need to be checked for pits, by a qualified agency. They are DOT tanks, and several things like rust, pits, dents, gouges, etc. can make them worthless.

Hi , l am interested in your propane tank, please let me know if you still have it thank you.