Wow, these old photos intrigue me. I know this photo is very old, but I just can't pass this up for more comments. I've been "training" myself with 1st-cycle gulls and this bird looks good for a 1st-cycle/winter Lesser Black-backed. The tertials are dark enough, the primaries seem to extend well past the tail, the bill is completely black (where in a Herring there is usually a has a pale base in late March), and the lesser, median, and greater coverts seem dark enough. I think I also see some second general scapulars or mantle feathers. The belly also isn't THAT dark, but it isn't completely out of range for an aberrant 1st-cycle Herring.
Sorry to bring this this topic up, it just intrigued me so much.