I have a Berg red G1350. Is there a serial # on the tractor to know if its one of the first 12 built. I have had it for a few years. As far as favorite MM toys, I would vote for the models made by Roger Mohr. I have an M5 gas wide front, M602 gas nf, Five star nf gas, five star standard lp, ZAU, ZTU, G705, & GTS. The Cottonwood acres models are also nice replicas.
Here is a list of the 1/24 models made by Ertl in the 60's & early 70's.
Thermogas-solid yellow, has a front grill like early M670.
M670 super-solid yellow with a white stripe along the sides (most available)
M670 early lp-solid yellow
M670 early gas-solid yellow
M602 lp-brown belly and yellow hood
M602 gas-brown belly and yellow hood
The super M670's should be about $15 in original condition, $35 in restored, and about $175 new in the box.
The thermogas might bring $150 in original condition. The early M670's and M602's seem to bring around $75 in original condition.
Here are some other toys produced through the years:
Slik UB-1950's, $100 origial condition, over $1000 new in the box
G1000 Vista, late 1960's, $200 restored, over $500 new in the box, (2 variations)
G1355, 1974- $150 original, $400 new in the box
G1000 Mity Minny puller, $100 original, $150 restored, $350 new in box.
My collection started in 1975 when I got a Mity Minny puller for my 3rd birthday. I still have the toy. I bet I had a million dollars worth of fun with that first little toy. The g1000 is still one of favorite MM's.
G1000 FWA, Jet star 3 Industrial, UTI, UBDIESEL,M5 Diesel, 5* (#7), G900, G1000 Vista, (2)A4T-1600, and several other great MM tractors, tons of MM custom toys