Identifying this lock

[Squelchtone]

So I am fairly new to the site, so I apologize if this is the wrong place to post this.

I'm trying to identify this lock so that I can try to make a new key, as the old one has been lost. I figure making a new key is a fair bit cheaper than getting the local locksmith involved. The door is to a small tool storage room in my grandfathers shop building and I'd really like to get it open again.

Here's the lock in question: http://i62.tinypic.com/2zteww5.jpeg

Any information is very much appreciated.

[billdeserthills]

I think it looks like a schlage "F" series keyway. I don't see how you are gonna make a key for it, even if you have the blank in your hand, impressioning this lock would surely be an advanced hobby
I would think it would be about all a beginner could do to simply pick open the lock. Is it your pic, or is there something broken off in the keyway?

[femurat]

I see the light coming from inside the keyway... how is it possible? There should be a tailpiece back there. Am I missing something? Do you mind to better explain the situation?

Thanks

[1mrchristopher]

Appears to be a mortise cylinder, which would explain the lack of a tailpiece. Very bright light though to be coming from behind the lock and look like that.

[I Pik U]

If you have a blank, shim the cylinder, careful to keep the pins in their proper sequence if needed, and file the key to fit.
Of course the door needs to be open to remove the cylinder.

[Ethanuel]

Even I was of a similar idea that getting a new key would be cheaper then getting help of a local locksmith...But trust me, its the best to take help of a professional....making a new key wouldn't really guarantee that it would fit the key hole....