I'm not really sure. I can tell you though that I bought a 1995 comparable B7100 in May of 1999 for around $8,000. That was the same basic tractor with HST, the 5 ft mower, rear tire chains, and a "very experienced" (in other words pretty beat up) back blade. It had about 250 hrs on the meter. Here in SE Michigan I've seen B7100s with 4wd and HST selling for anywhere from $5,000 to $9,000, depending on hours and attachments. I'd guess yours would be somewhere at the middle to lower end of the scale with 1,900 hours. Maybe the $5,500 to $6,500 range, assuming it's in good shape.