The Electrum was the sister to Spoiler bass. Nothing is ever really discontinued (we wouldn't be very custom if it did), but we do drop models from the brochure from time to time. It's a neck through guitar with construction details similar to Spoiler basses.
The Electrum has its own body shape, at least 3 different peghead shapes and 3 different electronics configurations. Most had 2 pickups with 2 volumes and 2 filters, though some were 3 pickup versions with a 5way switch. The other package had 2 volumes and 2 passive style tone controls instead of filters.
The one on ebay currently was from a special group we made for a store in CT (sadly, they aren't around anymore). These Electrums were almost all set neck versions.