The 1889 patent date only appears on a 4th Model. Also, the 4th Model was the last one to have a pinned front sight and the first one to have a oval trigger guard.
The serial number is important for this model, since production started in 1883 and ended in 1909, so both antique and modern guns are in this model category. There were a boatload of them made, about 240,000 of this model made and overall, 327,641 of all models of 32 DA manufactured.
Many collectors honed their repair skills on the little 32 DA, since both original and parts guns are quite inexpensive. There are often parts available on ebay and some found on gunpartscorp.com and other gun parts sites as well. If you are not doing the work yourself, I would hesitate to pay for any repairs. Fist, few gunsmiths will touch these guns and the cost would far exceed the value. You can buy a nice shooter 32 DA for under $200 if you look at gun shows and online gun sites. 32 S&W ammunition is available and works great in these little revolvers. They are very anemic and be careful what you shoot at or you may get bounce back. They might penetrate 1/2" plywood but would only dent a hardwood target.
If it was an heirloom, keep it!! If it has no sentimental value, consider selling it as a parts gun for someone else to fix and go buy a better one.
