David Sams Model 41

I recently purchased a S&W EFS Model 41 on Gun Broker. 
I noticed it had a bomar rear sight instead of the typical S&W rear sight.
When the pistol arrived I was hit with another strange out of the ordinary for a stock model 41 crown, 
it was recrowned and I had never seen one like this before, until I went to David Sam's website and looked 
at their services and saw the crown they put on a 5 1/2 model 41 barrel. 
Now I can't wait until after the holiday to find out from them just what they may have done to this pistol.
So far I know the crown, but not sure if they put a barrel liner in. Also I can tell the trigger pin was removed,
so they did a trigger job. Outside of that I'm sure this will be one sweet shooting pistol, early serial number, 97k range. The description from the seller mentioned nothing of the custom work, and photo's did not show the front end of the pistol, so the crown would have been noticed. Does anyone know how long they  have been in business for ?   
https://www.gunbroker.com/item/836819457

Interesting, from the pictures the dovetail that the rear sight is in looks larger, could be the pictures though. Let us know how it shoots.  Good luck and happy Turkey day

+1 on the unusual height of the rear sight.  Also, can't tell from the pictures if the barrel is a "Lazy &" or not which would generally be the case with an early series gun.  Very early series guns have script style serial number lettering, then changed to more block form, then began with "A".  

From the pictures of the top of the barrel, it appears that it may be a extendable front sight rib.  That little mark behind the front sight on the rib denotes the location for standard long barrel sight radius when the rib is extended. See if those little hex screws can be loosened and the entire rib and front sight can move forward.  If that is the case, then it is unfortunate the original rear sight was replaced from a collector standpoint (these are the second rarest M41 barrels when original). Although an extendable front sight may help offset the height of the replacement rear sight.  No matter what was done, a lot of the early guns, with and without modifications, are excellent shooters if well taken care of.

CR

The rear  sight is a Bomar, not your typical S&W rear sight. 
In my post the S&W EFS that's the abbreviation they use for extended front sight. Gives the 5 1/2 the same sight radius as the 7 3/8 barrel.
They used so many different &, you will find lazy's up to A130000 and yet you will find pre A models with a smaller &. The script in the smith & Wesson is also varied, as the didn't use the same roll stamp set ups.
So my pistol is still in the 97000 range but no lazy &.

I think that a more accurate description of "typical" sight may be "what they had a lot of at the time", two of my uppers have Bo-Mar & one with a model 52 style sight.

I recently purchased a model 52-1 that was also sporting the same Bomar rear sight, and when looking from the back of the pistol, it's was difficult to see any difference, the big rear blade made it look like the typical 52 rear sights. Which I have never had to adjust once set.