LEGO Set

4.5V Supplementary Set

870-1

Released: 1977 · Parts: 22 · Theme: Expert Builder

4.5V Supplementary Set (870-1) is a Expert Builder LEGO set released in 1977 with 22 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. Collectors browsing Expert Builder sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. This set includes 14 unique part types.