Quick Question About Postage Stamp...

I have one of these $8.75 Express Mail stamps and I was wondering if I could use it for postage??
I Believe express mail was changed to Priority Mail, but can it still be used?

Thank you in advance for any help.

Why not? I had more parcels of all kinds with these and other common definitive and commemorative issues on them sent to me over several years. But I am in Canada and am assuming that I may be correct.

It's valid US postage for any mailpiece of any class originating in the US. You could use it on an ordinary first class parcel of the requisite weight.

Thank you for your answers!

For future reference, there's only a few US postage stamps you can't use for regular mail.

Presorted, Bulk Rate, or Non-Profit rate stamps (along with other precanceled stamps) can only be used with an appropriate mailing permit from the USPS; otherwise they are invalid for postage. There are a couple of regular first-class rate Christmas issues (1970 and 1974) that are precanceled; the 1970 one is definitely not accepted as postage anymore, and the 1974 one might be refused as well on the basis of being precanceled (though IME many people use them just fine).

Special Delivery, Special Handling, and Certified Mail stamps are all invalid for postage, as are postage dues, revenues, and any other non-postage issue.

And while it's unlikely you'd want to use them, US stamps issued before the Civil War have all been demonetized.

Legally I think it is anything 1861 and older that can't be used, as the Confederate government seized all southern PO's and the US government declared all US postage stamps invalid for postage, but the people in US territory could trade in their old stamps for the new designs. That eliminated the possibility of illegal sales of Confederate seized US postage stamps. All US stamps produced after 1861 are still legal to be used as postage on mail.

I wonder how often somebody tries to sneak a #26 through, just to make a curiosity. Probably not as many as when 3 cents was actually a postal rate, but...