Our printer uses satin black wooden frames with an acrylic "glass" (unmatted). Here's an example of a framed Church Accommodations (1870) from the office.
We're typically DIY kinds of folks, but when we got the samples from the printer we were really impressed with the quality of the frames! Here's a close-up shot of a corner so you can see the finish and construction a little more clearly (excuse the dust, I'm terrible at sealing brick).