Prime-Line SE 27580 2-1/2 in. Backset, Entrance Mortise Lockset, Wrought Solid Brass, Right Handed (Single Pack)

This was the exact replacement. Quality is good as well. Easy to install.

Fits perfectly on my steel door.

This lock set serves its purpose, but I'm only giving it 3 stars because there were pieces missing. It was missing one of the #8-32 x 1.5" Phillips Pan Head screws for the door knob rosette. And the holes for these screws were too wide (I'm not sure if that was intentional or not). It was missing the plastic strike dust box that goes in the door jamb. Also, one of the cylinder rosettes was damaged (looks like it was dropped and flattened on one side). For security reasons, i needed to get this installed and in use, so I didn't have the luxury of time to return, so I found another screw from an old door knob and reshaped the rosette as much as I could (and used that on the inside of the door). It's functional and secure, as designed.

I was trying to find someone that could come and put a lock on my old door until I searched and found the Segal lock. This lock fit perfectly. And now my door looks so much better.

This was a perfect replacement for a Marks model 90 rhr mortise lock. I ordered a lhr because that’s what’s it “should” be based on the operation of the door. But really it was a rhr flipped upside down. Switching the inside mechanism was very easy. Just proceed slowly and be observant on the lay out of the guts before removing. The instructions offer pretty clear step by step. The one thing I did change was the locking bar. I made It so the handle can be used from either side not just the inside. It’s not a security door so this is ideal for my situation. All in all it was a breeze to switch around and install. Under 30 min including removal of old and changing operations and install. Bought this one used and it is in perfect working condition. Saved about $70!

I have a 90 year old front door whose mortise lock no longer works. We couldn't enter from the front any more! But finding a replacement for it seemed almost impossible. I was quoted $1000 for a similar Baldwin lock from a specialty hardware outlet!! The Segal lock was an almost identical fit to the original, and modifying the door to accept its doorknobs was mostly straightforward. I had to switch it to a left handed lock, but the clear directions that accompanyed the lock made this a snap - very easy to do. I now have a beautifully-solid operating front door that's more secure than ever! And for an extremely low price!!! I would have been willing to pay triple what I paid for the quality of this lock. I strongly recommend this company and this lock if you should have the misfortune of replacing a 90 year old mortise lock like we had.

Good

This is a high quality replacement for a Marks mortise lock. I wasn’t exactly sure what style I needed (RH vs LH) because my assembly is upside down, but the included instructions easily allowed me to reverse the handing. Only downside was there is little to no information online for this lock, when I took the cover off, 2 of the springs popped off. I was able to look at a rehanding video for a marks lock to see where they needed to go.I love the fact that if the handle lock (button above the latch) is locked, you can still use the key to unlock the door and handle.