I've no idea how that was done, but I did have a play around with that texture and this is what I came up with. It's very convoluted but i've tried to put together all the values I used for it.
Each layer starts with a copy of the original image unless noted, this was done in photoshop.
Background
Original image
Layer 1
Menu-Filter-Brush Strokes-Accented Edges
Edge Width 5
Edge Brightness 8
Smoothness 3
Blend Mode-Linear Burn
Opacity 15
Layer 2
Menu-Filter-Other-
High Pass 10
Blend Mode-Normal
Opacity 5
Layer 3 (This gives it a splotchy look)
Background copied to new file
Menu-Filter-Texture-Grain
Grain Type-Contrasty
Intensity 67
Contrast 13
Image size increased to 500% then canvas size reduced to 20%
Converted to Grayscale then back to RGB
Copied as new layer in original file
Blend Mode-Pin Light
Opacity 35
Layer 4
Random slotches done in black
Blur is applied
Blend Mode-Normal
Opacity 30
Layer 5
Covered in colour #a59f8f
Blend Mode-Normal
Opacity 50