Manufacturer unknown: Currently not available;
Used on the hinged patio door:
Uses 2 individual latches, Hole spacing for the latches is 6 Centers.
One is a spring latch, the other for the deadbolt.
Standard 2-3/8 backset
The most common problem is the internal spring on the handle breaks. may be replaced with other styles with 6 inch center lines.
# 40055 Bright Brass, # 40056 Antique Brass.
The # 40050 Kit to rebuild the handle spring may work on this handle.
2-3/8 Latch and deadbolt combination part # 40051

Related Parts:
# 40050 Replacement Handle Bushings - Sold Each
# 14421 - Less expensive Version with Different Look

Additional Resources:
Article: How to Replace the Bushing on Patio Door Handlesets
Video: How to Replace the Bushing on Patio Door Handlesets