DTR550 Versions?

I always thought that the DTR410 was the only radio in the DTR series that had the non-replaceable antenna. But I'm seeing DTR550's show up on eBay for instance with a non-replaceable stubby antenna. It was my understanding that the DTR550 and DTR650 had replaceable antennas.



So is the eBay auction below really a DTR550, and, is that stubby antenna replaceable?



Motorola DTR550 Digital 2 Way Radio Walkie Talkie Charger 2 Batteries 411378210517 | eBay