You don't see these every day... This is a single continuous belt of 251 rounds of HXP 66 M2 Ball 30-06 linked ammunition. The belt includes the "starter tab" too.
The ammo is clean, in great shape, and has been stored in a sealed ammo can in a climate controlled room. Greek HXP ammunition is high quality and great "Garand food" but can also be used in other 30-06 platforms.
For more background and history on linked 30 caliber ammunition, there's an informative article by Charles Brown in Small Arms Review. You can find it by going to the Wikipedia entry for "M1 link" and then clicking the article under references.