over time the End caps changed to black. BUT the need for DX coding came in, and so newer designs came out with the Crimped end caps, and lithographed body having a bar code and the alll important film speed contacts.
The spanish firm AP Photoplast sold a version of the old AGFA/Ilford cassette just for bulk loading, but the quality has gone downhill, and I gather the tooling that they were made on has worn out. Freesyile had had the AP cassettes under there ARISTA brand on clearnace for a while and only the ASA100 DX version was left.
I don't know if AP made these or they actually came from AGFA. I am sure Simon will not be in a position to comment on where Ilford has been getting their cassettes. (I recall a distributor rep answering a quiry when the crimped cassettes came out mentioning that Ilford actually bought their cassettes from Agfa. but I am not sure if that was refering to the old style or the crimp style)
The Ilford cassettes of 50 years ago were MAGNIFICENT. I only ever had a couple of them, and one of those got away from me. The end caps were Drawn Aluminum. the cassette body was also thin aluminum and fully feft lined. the end caps were held on by the paper label which you could cut with your finger nail to remove the caps. Since the caps overlaped the body by about a 1/4 inch they would be imposible to DX code.