I think it might be locked for RU / CIS, I can see the following locks for it
RU/CIS: {sub/975738} (confirmed)
CN: {sub/863939} (confirmed)
LATAM (without Mexico): {sub/863941} (confirmed)
SEA: a region-locked key, not indexed yet {sub/863942} (confirmed)
ME + Turkey + South Africa: a region-locked key, not indexed yet
Everyone else: {sub/863943} which can be redeemed everywhere apart from RU/CIS, some LATAM, some SEA, ME (confirmed). The full list of countries that cannot redeem this key is: Argentina, Armenia, Azerbaijan, Bahamas, Bangladesh, Belarus, Belize, Bhutan, Bolivia, Brazil, Chile, China, Colombia, Costa Rica, Ecuador, El Salvador, French Guiana, Georgia, Guatemala, Guyana, Honduras, Hong Kong, India, Indonesia, Kazakhstan, Kuwait, Kyrgyzstan, Malaysia, Nepal, Nicaragua, Pakistan, Panama, Paraguay, Peru, Philippines, Qatar, Republic of Moldova, Russian Federation, Saudi Arabia, Singapore, South Africa, Sri Lanka, Suriname, Taiwan, Tajikistan, Thailand, Turkey, Turkmenistan, Ukraine, United Arab Emirates, Uruguay, Uzbekistan, Venezuela, Viet Nam
Cassette beasts
1,5 TF2 key / 2€ pp / Latam unlocked version
Fast trade, day off from work :)