Home / Stamps / Australia & Territories / Elizabeth II Decimal / Centenary of Commonwealth of Australia Constitution Act. Gutter Pair Centenary of Commonwealth of Australia Constitution Act. Gutter PairPrice: $1.20 2000 Centenary of Commonwealth of Australia Constitution Act. Gutter Pair. Mint Unhinged 2 in stock Quantity Add to cart SKU: 100753 Categories: Elizabeth II Decimal, Stamps Specifications Value Appraisal Product Features Additional Products 49th Anniversary Declaration $9.00 BUY NOW Centenary of Western Australia $1.00 BUY NOW Opening of Parliament House $0.50 BUY NOW 3d Airmail Type A $4.00 BUY NOW