This common knife came from the Sparkle Time Pack, where you could buy it on its own for coins or grab the whole pack; the pack has since left the shop, so trading is the only way in now. People mostly pick it up to round out a Sparkle-themed inventory, not as a trade centerpiece. If you want something in the same value range, Swirly Gun and BattleAxe II are the usual names that come up.
Sparkle7 is a Common knife in Murder Mystery 2. Its combined value is 18, #31 of 335 common items and #282 of 921 valued items overall. Demand is low: it sits in inventories for a while, and buyers often ask for a discount.
Closest in value: Swirly Gun (18), BattleAxe II (17.5), Ginger Luger (17.5). Use them as a benchmark for a fair one-for-one trade.
Value history
What it is worth in other items
How many of each item equal one Sparkle7 by value. Demand differs between items, so check it before you trade.