This is very nice vernier compass made by L Beckmann Co.

The compass is a pretty standard size - 15 inch mainplate and a 5 inch needle. The sight vanes are 8 inches tall. The vials have liquid.

I believe this to be circa 1890s based on the serial number of 5737. The compass could be circa 1900s or so however. I don't have anything that pegs serial numbers to dates, especially as the serial numbers go higher. I have seen Beckmanns with serial numbers above 10,000. Below is a pic from a 1903 Beckmann catalogue which shows an illustration that looks like this compass.

This compass is pretty cool for a couple of reasons. First, you set the vernier with a little pin wrench. I don't have the original, but I'm including a spare one I have. This is the first time I've seen this system. The vernier system has two clamp screws that require old type skinny screwdriver heads. I loosened the clamps for now so you can work the vernier system with the included pin wrench.

Second, Beckmann devised a way to reduce the weight of the compass. Take a look at the pic below that shows the bottom of the compass. The compass is lighter than other similar sized compasses as a result. The sight vanes are constructed the same way.

Please see my Louis Beckmann Makers Webpage for more info about this surveying instrument maker.