If these were given to you as a gift, then you have good taste in friends!
I would agree with cybersnyder's estimate. That seems to be a good price for a set in that condition. I haven't seen very many of that specific size. By the dimensions I would guess that they would be the soapbar series, with model names such as "M4.5N", "M4.5W" or "M4.5HB".
The specific type of armature inside each pickup can be determined from the model name, which would be inscribed on the back or perhaps written on an adhesive label. If you feel comfortable removing the pickups to look at the back, I'm sure we could figure out which armatures were inside. If not, you can use magnetic paper to look at the pattern of the magnetic fields, and we could make an educated guess.
I maintain the (outdated) Lane Poor community archive website, accessible at lanepoor.net. Legacy Pickups has also restarted Lane Poor's old business which ended in 2000-2001 and their website at lanepoor.com also has information about the pickup armatures.
In addition to the web references, I also have some hard-copy papers buried somewhere (in a safe place) which go into more detail about the armatures and how they should sound. Also, some enterprising bassists have dissected their own Lane Poor pickups for further study of the internals.
In any case, the pickups are definitely valuable, and I'm sure you'd find a willing buyer in not much time at all. In fact I might even have a bass that could accept those pickups.
One point of caution: if you sell them, you might regret doing so later. I had an opportunity to sell one of my old Lane Poor pickups (for dissection as mentioned above) some years ago, and even though the money was good, I still wish I had it with me now.