I've found some info at this link:
http://www.scooterlounge.com/Lambretta/ ... veta.shtmlBasically the story is that in the late 60's Lambretta stopped producing the Li150 Special and the SX200 because they released their new GP line of scooters. Lambretta sold the presses and rights for these models to the Spanish company Serveta who continued to make these two scooters under licence until about 1980.
The Serveta produced Li 150 is mostly the same as the Innocenti produced Li 150 but there are some differences. The body panels are virtually the same, although the rear cowls do attach slightly differently. The Serveta models usually had different (ie. larger) blinkers and taillight to meet new USA regulations. The controls were also black plastic instead of metal. The motor is exactly the same except for the air filter and the magneto.
According to ScooterLounge.com, the quality of the Serveta's is decent but perhaps not quite as good as an Innocenti produced scooter. The main problem areas are the carburators, engine cases and electrical.
The value of these scooters is listed at:
# Rough but restorable = $700-1200
# Drivable, but not show = $1500-2500
# Restored or Excellent Original Condition = $2500-3500 (up to $4000 for the Jet 200)
My thoughts on this scooter are that $900-$1000 seems like a good buy, but this is going to be a big job and you need to be sure you are up for all this work. Getting the electrical wiring sorted out is probably going to be a headache. I'm not sure, but the wiring harness might be totally different than the regular Li150 so you might have a hard time getting this sorted out. If you want something to work away on then this will be perfect, but if you are expecting to fix it up quickly and cheaply then you might be in for a surprise. I think parts are generally hard to find and kinda expensive. Just odds and ends that you may need (ie. new brake cables? tires? brake pads?) can easily add up to hundreds of dollars. I thought I was going to get my '83 Beluga fixed up for dirt cheap, but it ending up costing about $600 on top of what I paid to get it on the road and that scoot was mostly intact to start with. You always run into some surprises (like a clogged exhaust) that set you back.
If you buy this, what are you going to do with the Riva 180? Are you still going to work on that as well?