Not too complex, but just enough to make mounting parts and soldering connections easy. It's the BusBoard Prototyping Systems PR2H2 solder protoboard, with just 2 holes per segment.

Features:

• ProtoBoard-2H has a general purpose stripboard circuit pattern that is pre-cut with 2 holes per segment.
• 2.54mm (0.1") hole spacing for DIP integrated circuits and headers.
• Busboard Size 1: 50 x 80mm (1.97 x 3.15in),  1.6mm (1/16") thick
• Four mounting holes for enclosure attachment.

Specifications:

• Etched FR4 glass-epoxy circuit board.
• Single sided, 1oz/ft 2 copper with an anti-tarnish coating for easy soldering. Lead free and RoHS compatible.
• Holes are drilled on 2.54mm (0.1") centers.
• 0.94mm (0.037") holes sized for ICs or square post headers.
• 31 x 19 holes (589 total), Four 0.125” mounting holes.

• [Documentation]: ProtoBoard2H-1 Rev 4.00