Yes, it is Seiko 6138-0040 a.k.a. Seiko Bullhead cause crown and double pusher in top of face.
Bullhead model is rare and very unique.
Coming with brown face then well-known as Brown Bullhead.
Value for this model can be check at online stores around the world, like ebay.com or amazon.com.
Value about US$800-2000 depends on condition.
The Bullhead that i am offering is good condition watch as a vintage watch.
From early collector i have information that this watch is coming with original parts (exclude strap).
For the buyer i will give a premium leather strap best condition.
Movement and chronograph working. Reset sometimes to zero, sometimes not to zero. Hour chrono sometimes start alone without start chrono.
Remember that this watch is collectible and have lifetime value.
Enjoy this picts and video: