ISO Printer/Mail House

Hi Everyone hope all is well. We are going to be trying a new thing this summer for some of our membership sites and was wondering if anyone knows of a printer that can do a 4 x 6 postcard (adult friendly) with a unique (between 12 to 16 digital) number printed on the back side?

Basically we can generate the codes for the backs of the cards, we are going to be importing them into our system to track where the cards came from in our marketing efforts this summer.

The code for the consumer will be equal to a discount or free time on one of our sites.

We are looking to print between 15k to 20k.

If anyone has any ideas please let me know your thoughts.

Cheers hope you all are having a good week!

You could talk to Breene Graphics. They print 4x6 cards for us, and they're amazing quality. But I don't know if they have the capability to serialize them.